Using it I can convert wave files to mid files. First I convert MP3 to wav files this way:

$ mpg123 -w file.wav file_original.mp3

Then finally I convert the wav to mid using this command:

$ ./waon -i file.wav -n 2048 -b 60 -t 120 -o file.mid

After converting many music files to mid I decided to convert an audio voice (postcast) and try to understand it (I suggest you to start with a slow audio like these at http://learningenglish.voanews.com).

Initially you cannot understand nothing, but after few minutes your brain adapts to it and will understand everything.

UPDATE 2: I didn’t find a serial connector in the board, then I searched in the datasheet and discovered UART1 RX is pin 87 and TX is pin 88. Then I connected a small wire from my USB/serial dongle to pins 87 and 88, then after testing many serial configuration I discovered that they are using an unusual baudrate 38400 8n1 and finally got the boot log: